... fan or be used in the occasion where the Oil, smoke, dust is serious, such as kitchen, toilet, mineral&industrial factory ... ’’38050210950620013568YWF4D-600/24’’380506501360865018076YWF6D-600/24’’38050360930670014070Model explalation YWF 4 E - 400 1 2 3 4 1,YWF: External rotor axial ... poles:2—2 poles,4—4 poles,6—6 poles3,E-- Single-phase motor,D--three-phase motor4,Fan blade diameter ...